CA2202967C - Overvoltage suppressor - Google Patents
Overvoltage suppressor Download PDFInfo
- Publication number
- CA2202967C CA2202967C CA002202967A CA2202967A CA2202967C CA 2202967 C CA2202967 C CA 2202967C CA 002202967 A CA002202967 A CA 002202967A CA 2202967 A CA2202967 A CA 2202967A CA 2202967 C CA2202967 C CA 2202967C
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- CA
- Canada
- Prior art keywords
- overvoltage suppressor
- connecting fittings
- loop
- suppressor
- overvoltage
- Prior art date
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- Expired - Fee Related
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C7/00—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material
- H01C7/10—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material voltage responsive, i.e. varistors
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C7/00—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material
- H01C7/10—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material voltage responsive, i.e. varistors
- H01C7/12—Overvoltage protection resistors
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- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Thermistors And Varistors (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The overvoltage suppressor contains two connecting fittings which are spaced apart from one another along an axis (z) and between which at least one cylindrical varistor element is arranged. The connecting fittings and the at least one varistor element are braced with respect to one another, forming a contact force, to form a mechanically robust active part of the overvoltage suppressor. The active part is sheathed by a molded housing made of insulating material. In each case, one material cutout is formed in each of the two connecting fittings with a section which runs essentially transversely with respect to the axis (z), is designed in the form of a slot and extends from the outer surface of the fitting to beyond the axis (z). A loop, which absorbs the contact force, is inserted into the sections, which are in the form of slots, in the region of the loop ends beyond the axis (z), and each of the two loop ends rests on in each case one surface which bounds the section which is in the form of a slot. The overvoltage suppressor is distinguished by good mechanical and electrical characteristics and can be produced in a particularly cost-effective manner.
Description
OVERVOLTAGE SUPPRESSOR
BACKGROUND OF THE INVENTION
Field of the Invention The invention is based on an overvoltage suppressor as claimed in the preamble of patent claim 1.
Discussion of Background The invention in this case refers to a prior art as results from EP 0 614 198 A2. An overvoltage suppressor which is described in this prior art includes a plurality of cylindrical resistance elements having a varistor behaviour, which are arranged stacked one above the other in the form of columns between two electrical connecting fittings. A clamping part, which holds the varistors and the two connecting fittings together forming an axially acting contact force has at least two loops whose ends rest on the connecting fittings. A molded housing made of a weather-resistant plastic surrounds the varistors, the loops and the predominant part of the connecting fittings.
The production of such an overvoltage suppressor is relatively complex since two or even more loops are required to fix the suppressor active part, which is in the form of a column and contains the varistors and connecting fittings, and to produce the contact force.
SUMMARY OF THE INVENTION
Accordingly, one object of the invention is to provide an overvoltage suppressor of simple construction, of good mechanical and electrical characteristics and which can at the same time be produced in a particularly cost-effective manner.
In comparison with an overvoltage suppressor according to the prior art, the overvoltage suppressor according to the invention has the advantage that it requires only a single laop to fix and brace two connecting fittings and at least one DOCSMTL: 15042990 varistor which is held between the fittings. The overvoltage suppressor can thus be produced in a particularly economic manner. Only one prefabricated template, which temporarily ensures axial guidance, is required to assemble it, in which template the connecting fittings and the at least one varistor are initially stacked in the form of a column and are then connected, by fitting the loop, producing prestressing, to form the mechanically robust active part of the overvoltage suppressor. Since the axis of the active part, which is designed as a column, in this case passes essentially symmetrically through the loop ends, the loop produces a uniform contact force in the entire active part. Thus, this ensures a uniform current density of a suppressor current which is carried in the active part when an overvoltage occurs, and unacceptably high local heating of contact junctions in the active part is thus avoided with a high level of confidence.
According to the above-mentioned object of the present invention, from a broad aspect, there is provided an overvoltage suppressor which comprises:
i) a columnar active part having a central column axis; the active part includes two connecting fittings which are spaced apart from one another along the column axis and each includes an outer surface;
ii) at least one cylindrical varistor element is arranged between the two connecting fittings;
iii) a clamping part which holds the connecting fittings and the at least one varistor element together with a contact force; the clamping part includes only a single loop made of insulating material and has two loop ends;
iv) a molded housing is made of electrical insulating material which at least partially sheaths the at least one varistor element and the clamping part;
v) a material cutout is provided in each of the two connecting fittings;
the material cutouts each have only a single slot section which extends transversely with respect to the column axis from the outer surface of each of the two connecting fittings to beyond the column axis; each of the single slot sections has a contact surface which bounds the single slot section.
The loop is positioned in the single slot sections in the two connecting fittings, and each of the two loop ends rests on one of the single slot section contact surfaces.
BRIEF DESCRIPTION OF THE DRAWINGS
A more complete appreciation of the invention and many of the attendant advantages thereof will be readily obtained as the same becomes better understood by reference to the following detailed description when considered in connection with the accompanying drawings, wherein:
Figure 1 shows a side view of an embodiment of the overvoltage suppressor according to the invention, in which a molded housing, which is indicated by dashed lines, is illustrated in transparent form;
' Figure 2 shows a plan view of a section along II-II through the overvoltage suppressor according to DOCSMTL: 1504299\ I
_ 3 ~ _ 96/076 Fig. 1 but now illustrated in perspective form, after the removal of the molded housing, and Fig. 3 shows, an exploded illustration of the ' overvoltage suppressor according to Fig. 1, . after the removal of the molded housing.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
Referring now to the drawings, wherein like reference numerals designate identical or corresponding parts throughout 'the several views, the overvoltage suppressor which is illustrated in Figures 1 to 3 has two connecting fittings l, 2, which are preferably composed of aluminum and are spaced apart from one .
another along an axis z. The connecting fitting 1 is i5 provided with a fastening device, which~is designed as a~threaded hole 11, for an electrical conductor which may be connected to high-voltage potential, but is not illustrated. The connecting fitting 2 may be Connected to ground potential by a fastening device which is designed as a threaded hole 12. Said cbnnecting fitting ,~~2 has' an axially aligned threaded hole 3 in which~a pressure screw 4 is guided such that it can be displaced in the axial direction. The designation 5 refers to a loop composed of a wound, glass-fiber reinforced strip which is embedded in a plastic matrix.
The two ends ~of the loop 5 are guided in sections, which are designed in the form of slots, of material cutouts 6, 7 which are formed in the connecting fittings 1, 2.
, A ,cylindrical varistor element 8 composed of non-linear resistance material; for example based on metal oxide such as Zn0 .in particular,, is arranged ;betwe,en the connecting fittings 1,, 2 ; forming a ' suppressor active. part in the form of a column.
~35 Alternatively, two or more varistor elements, which are ~. ' stacked one above .the other in the form of a column, may also be provided instead of,one element 8: . ' Electrically, conductive, parts, namely two .
spring elements 9, which produce contact pressure and . _ - 4 - 96/076 are ~in eachcase designed as plate springs, and a ' .thrust' washer 10, which is preferably composed of aluminum, copper or an aluminum or, copper allay, are . mounted such that they can be displaced in the axial direction in a cutout which is~ in the form of a disk y. "and ~is formed in the connecting fitting 1 (Fig. 2) . A
,thrust washer. 13,. which is composed of the same material as the part 10, is likewise mounted such that it can be displaced in the. axial direction in a.cutout, which is in the form of a disk, in the connecting fitting 2 (Fig. 2). Current transmission elements'.14 are arranged between the thrust washer 10 and the varistor element 8, and between the thrust washer 13 and ,the varistor element 8, and are in each case designed as a disk with grooves which pass concentrically around~the axis and are formed in both end surfaces of the disk (Fig. 3): The current transmission elements 14 are advantageously formed from annealed aluminum.
Fig. 2 shows that each of the sections which are marked by the designations 15, 16 and are in the form of slots extend essentially transversely with respect .to the axis z from the outer surface of~ the ' electrical connecting fitting 1 or 2, respectively, to beyond the axis z. Each of the two ends of the loop 5 is inserted beyond the axis z into the section 15 or 16, respectively, which is in the form of a slot,' and in each case rests on a surface 17 or 18, respectively, which bounds the section 15 .or 16, respectively, which , is in the form of a slot (Fig. 3). This ensures that, the loop 5 is held centrally in the region of the axis .
z, and ensures a uniform, contact pressure in the 1 suppressor active part. This ensures a uniform .current w density.of the suppressor current which is carried in 35, the suppressor active part when an overvoltage occurs.
.At the.same time, unacceptably high local heating in, the~'suppressor active part is avoided. ~ -w Increased confidence. against displacement of the loop transversely with respect to the axis z is v provided if the slots 15, 16 are inclined by somewhat more, than 90°, for example by up to 95° with respect to the axis, and/or if the slots 15, 16 have undercuts . which fix the loop ends and can be formed in the contact surfaces 17, 18.
The contact surfaces 17, 18 advantageously have a surface profile which is essentially in the form of a circular. arc. The loop ends then rest on. the connecting fittings 1, 2 with a, uniform, relatively slight curvature. This largely avoids undesirably high bending and shear stresses in the loops. ~ .
A rectangular, in particular square, cross-sectional profile of the loop 5 with a relatively narrow width transversely with respect to the axis z is particularly advantageous since the section 15 or 16, respectively, which is designed in the form of a slot, need extend only insignificantly beyond the axis z. The connecting fitting 1 ,or. 2 then has high mechanical strength. ' 2p The connecting fittings 1, 2 are partially , enclosed, and the varistor element 8, the thrust plates 10, 13 and the loop 5 are completely enclosed, by a molded housing 19 which is provided with shields and is made of insulating material, preferably of an.
elastomeric silicone (Fig. 1).
In order to produce this, overvoltage suppressor, the connecting fitting 2, the thrust plate 13, one of.the current transmission elements 14, the varistor element 8, a further current transmission element 14, the thrust plate° 10, the two spring elements 9 and the connecting fitting 1 are stacked one.
- above the other in sequence in a template, and are ' subjected to a prestressing force. The connecting ' ,.fittings 1, 2 are , in this case aligned ,such that, the .
two sections~l5, 16,, which are in the form of slots, are located one. above the other such that they are superimposed (Figures 2 and 3). A prefabricated loop 5, , , which is preferably composed of a wound prepreg which ' is in the form of a,strip.and has been cured after CA 02202967 1997-04-17 .
winding, is then, pushed so far into the slots 15, 16 that the axis, z passes through the loop ends_ The prestressing force is then removed, and the suppressor active part is~ thus complete. Contact and retention force. can additionally be produced in the suppressor active part by twisting the pressure screw 4:
Instead of a prefabricated loop, a loop can also be used which is formed during the production of ' ,the overvoltage suppressor. To this end,,a strip which is subjected to a prestressing force is wound around the suppressor, active part and is placed on the two contact. surfaces 17,' 18. In this case, the two . connecting fittings l, 2 are braced firmly to one another' forming a contact force, and a mechanically robust active part of the overvoltage suppressor to be produced is thus formed.. This bracing is in general completely sufficient on its own for good mechanical strength of .the suppressor active part. If a strip having adequate elasticity is used, such as a strip manufactured from glass fibers for example, the spring elements 9 may thus possibly be omitted.
Such a strip is preferably- a prepreg, particularly based on glass fibers and epoxy resin. A
~prepreg has a good,adhesion effect. A loop which ~is ' wound from'a ~prestressed prepreg is thus robust even without any additional fastening device after winding, and can then be cured at elevated temperatures . A loop is then formed in this case which ~is composed of glass ' fibers and a cured plastic matrix in which the glass fibers are embedded.
In addition to making good contact with the individual parts which are located in. the current path betweeri the two connecting fittings; the bracing of the, . two connectings fittings 1, 2, at the same time ,also results'in the grooves of. the current transmission elements l4 being closely joined at the end surfaces of the' varistor, element 8 andvof the thrust washers 10, 13. I,f the . suppressor .active part is subsequently ' extrusion coated with insulating material, preferably based on an elastomeric silicone, this avoids ingress of the liquid insulating material between the individual parts located in the current path.
Obviously, numerous modifications and variations of the present invention are possible in light of the above teachings. It is therefore to be understood that within the scope of the appended claims, the invention may be practiced otherwise than as specifically described herein.
BACKGROUND OF THE INVENTION
Field of the Invention The invention is based on an overvoltage suppressor as claimed in the preamble of patent claim 1.
Discussion of Background The invention in this case refers to a prior art as results from EP 0 614 198 A2. An overvoltage suppressor which is described in this prior art includes a plurality of cylindrical resistance elements having a varistor behaviour, which are arranged stacked one above the other in the form of columns between two electrical connecting fittings. A clamping part, which holds the varistors and the two connecting fittings together forming an axially acting contact force has at least two loops whose ends rest on the connecting fittings. A molded housing made of a weather-resistant plastic surrounds the varistors, the loops and the predominant part of the connecting fittings.
The production of such an overvoltage suppressor is relatively complex since two or even more loops are required to fix the suppressor active part, which is in the form of a column and contains the varistors and connecting fittings, and to produce the contact force.
SUMMARY OF THE INVENTION
Accordingly, one object of the invention is to provide an overvoltage suppressor of simple construction, of good mechanical and electrical characteristics and which can at the same time be produced in a particularly cost-effective manner.
In comparison with an overvoltage suppressor according to the prior art, the overvoltage suppressor according to the invention has the advantage that it requires only a single laop to fix and brace two connecting fittings and at least one DOCSMTL: 15042990 varistor which is held between the fittings. The overvoltage suppressor can thus be produced in a particularly economic manner. Only one prefabricated template, which temporarily ensures axial guidance, is required to assemble it, in which template the connecting fittings and the at least one varistor are initially stacked in the form of a column and are then connected, by fitting the loop, producing prestressing, to form the mechanically robust active part of the overvoltage suppressor. Since the axis of the active part, which is designed as a column, in this case passes essentially symmetrically through the loop ends, the loop produces a uniform contact force in the entire active part. Thus, this ensures a uniform current density of a suppressor current which is carried in the active part when an overvoltage occurs, and unacceptably high local heating of contact junctions in the active part is thus avoided with a high level of confidence.
According to the above-mentioned object of the present invention, from a broad aspect, there is provided an overvoltage suppressor which comprises:
i) a columnar active part having a central column axis; the active part includes two connecting fittings which are spaced apart from one another along the column axis and each includes an outer surface;
ii) at least one cylindrical varistor element is arranged between the two connecting fittings;
iii) a clamping part which holds the connecting fittings and the at least one varistor element together with a contact force; the clamping part includes only a single loop made of insulating material and has two loop ends;
iv) a molded housing is made of electrical insulating material which at least partially sheaths the at least one varistor element and the clamping part;
v) a material cutout is provided in each of the two connecting fittings;
the material cutouts each have only a single slot section which extends transversely with respect to the column axis from the outer surface of each of the two connecting fittings to beyond the column axis; each of the single slot sections has a contact surface which bounds the single slot section.
The loop is positioned in the single slot sections in the two connecting fittings, and each of the two loop ends rests on one of the single slot section contact surfaces.
BRIEF DESCRIPTION OF THE DRAWINGS
A more complete appreciation of the invention and many of the attendant advantages thereof will be readily obtained as the same becomes better understood by reference to the following detailed description when considered in connection with the accompanying drawings, wherein:
Figure 1 shows a side view of an embodiment of the overvoltage suppressor according to the invention, in which a molded housing, which is indicated by dashed lines, is illustrated in transparent form;
' Figure 2 shows a plan view of a section along II-II through the overvoltage suppressor according to DOCSMTL: 1504299\ I
_ 3 ~ _ 96/076 Fig. 1 but now illustrated in perspective form, after the removal of the molded housing, and Fig. 3 shows, an exploded illustration of the ' overvoltage suppressor according to Fig. 1, . after the removal of the molded housing.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
Referring now to the drawings, wherein like reference numerals designate identical or corresponding parts throughout 'the several views, the overvoltage suppressor which is illustrated in Figures 1 to 3 has two connecting fittings l, 2, which are preferably composed of aluminum and are spaced apart from one .
another along an axis z. The connecting fitting 1 is i5 provided with a fastening device, which~is designed as a~threaded hole 11, for an electrical conductor which may be connected to high-voltage potential, but is not illustrated. The connecting fitting 2 may be Connected to ground potential by a fastening device which is designed as a threaded hole 12. Said cbnnecting fitting ,~~2 has' an axially aligned threaded hole 3 in which~a pressure screw 4 is guided such that it can be displaced in the axial direction. The designation 5 refers to a loop composed of a wound, glass-fiber reinforced strip which is embedded in a plastic matrix.
The two ends ~of the loop 5 are guided in sections, which are designed in the form of slots, of material cutouts 6, 7 which are formed in the connecting fittings 1, 2.
, A ,cylindrical varistor element 8 composed of non-linear resistance material; for example based on metal oxide such as Zn0 .in particular,, is arranged ;betwe,en the connecting fittings 1,, 2 ; forming a ' suppressor active. part in the form of a column.
~35 Alternatively, two or more varistor elements, which are ~. ' stacked one above .the other in the form of a column, may also be provided instead of,one element 8: . ' Electrically, conductive, parts, namely two .
spring elements 9, which produce contact pressure and . _ - 4 - 96/076 are ~in eachcase designed as plate springs, and a ' .thrust' washer 10, which is preferably composed of aluminum, copper or an aluminum or, copper allay, are . mounted such that they can be displaced in the axial direction in a cutout which is~ in the form of a disk y. "and ~is formed in the connecting fitting 1 (Fig. 2) . A
,thrust washer. 13,. which is composed of the same material as the part 10, is likewise mounted such that it can be displaced in the. axial direction in a.cutout, which is in the form of a disk, in the connecting fitting 2 (Fig. 2). Current transmission elements'.14 are arranged between the thrust washer 10 and the varistor element 8, and between the thrust washer 13 and ,the varistor element 8, and are in each case designed as a disk with grooves which pass concentrically around~the axis and are formed in both end surfaces of the disk (Fig. 3): The current transmission elements 14 are advantageously formed from annealed aluminum.
Fig. 2 shows that each of the sections which are marked by the designations 15, 16 and are in the form of slots extend essentially transversely with respect .to the axis z from the outer surface of~ the ' electrical connecting fitting 1 or 2, respectively, to beyond the axis z. Each of the two ends of the loop 5 is inserted beyond the axis z into the section 15 or 16, respectively, which is in the form of a slot,' and in each case rests on a surface 17 or 18, respectively, which bounds the section 15 .or 16, respectively, which , is in the form of a slot (Fig. 3). This ensures that, the loop 5 is held centrally in the region of the axis .
z, and ensures a uniform, contact pressure in the 1 suppressor active part. This ensures a uniform .current w density.of the suppressor current which is carried in 35, the suppressor active part when an overvoltage occurs.
.At the.same time, unacceptably high local heating in, the~'suppressor active part is avoided. ~ -w Increased confidence. against displacement of the loop transversely with respect to the axis z is v provided if the slots 15, 16 are inclined by somewhat more, than 90°, for example by up to 95° with respect to the axis, and/or if the slots 15, 16 have undercuts . which fix the loop ends and can be formed in the contact surfaces 17, 18.
The contact surfaces 17, 18 advantageously have a surface profile which is essentially in the form of a circular. arc. The loop ends then rest on. the connecting fittings 1, 2 with a, uniform, relatively slight curvature. This largely avoids undesirably high bending and shear stresses in the loops. ~ .
A rectangular, in particular square, cross-sectional profile of the loop 5 with a relatively narrow width transversely with respect to the axis z is particularly advantageous since the section 15 or 16, respectively, which is designed in the form of a slot, need extend only insignificantly beyond the axis z. The connecting fitting 1 ,or. 2 then has high mechanical strength. ' 2p The connecting fittings 1, 2 are partially , enclosed, and the varistor element 8, the thrust plates 10, 13 and the loop 5 are completely enclosed, by a molded housing 19 which is provided with shields and is made of insulating material, preferably of an.
elastomeric silicone (Fig. 1).
In order to produce this, overvoltage suppressor, the connecting fitting 2, the thrust plate 13, one of.the current transmission elements 14, the varistor element 8, a further current transmission element 14, the thrust plate° 10, the two spring elements 9 and the connecting fitting 1 are stacked one.
- above the other in sequence in a template, and are ' subjected to a prestressing force. The connecting ' ,.fittings 1, 2 are , in this case aligned ,such that, the .
two sections~l5, 16,, which are in the form of slots, are located one. above the other such that they are superimposed (Figures 2 and 3). A prefabricated loop 5, , , which is preferably composed of a wound prepreg which ' is in the form of a,strip.and has been cured after CA 02202967 1997-04-17 .
winding, is then, pushed so far into the slots 15, 16 that the axis, z passes through the loop ends_ The prestressing force is then removed, and the suppressor active part is~ thus complete. Contact and retention force. can additionally be produced in the suppressor active part by twisting the pressure screw 4:
Instead of a prefabricated loop, a loop can also be used which is formed during the production of ' ,the overvoltage suppressor. To this end,,a strip which is subjected to a prestressing force is wound around the suppressor, active part and is placed on the two contact. surfaces 17,' 18. In this case, the two . connecting fittings l, 2 are braced firmly to one another' forming a contact force, and a mechanically robust active part of the overvoltage suppressor to be produced is thus formed.. This bracing is in general completely sufficient on its own for good mechanical strength of .the suppressor active part. If a strip having adequate elasticity is used, such as a strip manufactured from glass fibers for example, the spring elements 9 may thus possibly be omitted.
Such a strip is preferably- a prepreg, particularly based on glass fibers and epoxy resin. A
~prepreg has a good,adhesion effect. A loop which ~is ' wound from'a ~prestressed prepreg is thus robust even without any additional fastening device after winding, and can then be cured at elevated temperatures . A loop is then formed in this case which ~is composed of glass ' fibers and a cured plastic matrix in which the glass fibers are embedded.
In addition to making good contact with the individual parts which are located in. the current path betweeri the two connecting fittings; the bracing of the, . two connectings fittings 1, 2, at the same time ,also results'in the grooves of. the current transmission elements l4 being closely joined at the end surfaces of the' varistor, element 8 andvof the thrust washers 10, 13. I,f the . suppressor .active part is subsequently ' extrusion coated with insulating material, preferably based on an elastomeric silicone, this avoids ingress of the liquid insulating material between the individual parts located in the current path.
Obviously, numerous modifications and variations of the present invention are possible in light of the above teachings. It is therefore to be understood that within the scope of the appended claims, the invention may be practiced otherwise than as specifically described herein.
Claims (10)
1. An overvoltage suppressor comprising:
i) a columnar active part having a central column axis; said active part including two connecting fittings which are spaced apart from one another along the column axis and each includes an outer surface;
ii) at least one cylindrical varistor element arranged between the two connecting fittings;
iii) a clamping part which holds the connecting fittings and said at least one varistor element together with a contact force, said clamping part including only a single loop made of insulating material and having two loop ends;
iv) a molded housing made of electrical insulating material which at least partially sheaths said at least one varistor element and said clamping part;
v) a material cutout in each of said two connecting fittings, said material cutouts each having only a single slot section which extends transversely with respect to said column axis from said outer surface of each of said two connecting fittings to beyond said column axis; each of said single slot sections having a contact surface which bounds said single slot section, and wherein said loop is positioned in said single slot sections in said two connecting fittings, and each of said two loop ends rests on one of said single slot section contact surfaces.
i) a columnar active part having a central column axis; said active part including two connecting fittings which are spaced apart from one another along the column axis and each includes an outer surface;
ii) at least one cylindrical varistor element arranged between the two connecting fittings;
iii) a clamping part which holds the connecting fittings and said at least one varistor element together with a contact force, said clamping part including only a single loop made of insulating material and having two loop ends;
iv) a molded housing made of electrical insulating material which at least partially sheaths said at least one varistor element and said clamping part;
v) a material cutout in each of said two connecting fittings, said material cutouts each having only a single slot section which extends transversely with respect to said column axis from said outer surface of each of said two connecting fittings to beyond said column axis; each of said single slot sections having a contact surface which bounds said single slot section, and wherein said loop is positioned in said single slot sections in said two connecting fittings, and each of said two loop ends rests on one of said single slot section contact surfaces.
2. An overvoltage suppressor as claimed in claim 1, wherein each of said contact surfaces includes a circular arc surface profile.
3. An overvoltage suppressor as claimed in claim 1, wherein said clamping part further comprises at least one contact force producing element selected from the group consisting of a spring, a thrust washer, and both, and a disk cutout in at least one of said two connecting fittings which receives said at least one contact force producing element.
4. An overvoltage suppressor as claimed in claim 1, wherein said single loop comprises a wound strip.
5. An overvoltage suppressor as claimed in claim 4, wherein said single loop comprises a wound strip embedded in a plastic matrix.
6. An overvoltage suppressor as claimed in claim 5, wherein said plastic matrix is formed by a step of curing a curable plastic before said single loop is placed on said contact surfaces.
7. An overvoltage suppressor as claimed in claim 6, wherein said plastic matrix is formed by a step of curing a curable plastic after said single loop is placed on said contact surfaces.
8. An overvoltage suppressor as claimed in claim 1, wherein said single loop has a rectangular cross-sectional profile.
9. An overvoltage suppressor as claimed in claim 1, wherein said two connecting fittings define a current path, and further comprising at least one deformable current transmitting element provided in said current path.
10. An overvoltage suppressor as claimed in claim 9, wherein said current transmitting element comprises a disk having end surfaces, said disk including concentric grooves as said end surfaces which pass around said column axis.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19622140.4 | 1996-06-01 | ||
| DE19622140A DE19622140A1 (en) | 1996-06-01 | 1996-06-01 | Surge arresters |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2202967A1 CA2202967A1 (en) | 1997-12-01 |
| CA2202967C true CA2202967C (en) | 2005-03-29 |
Family
ID=7795952
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002202967A Expired - Fee Related CA2202967C (en) | 1996-06-01 | 1997-04-17 | Overvoltage suppressor |
Country Status (17)
| Country | Link |
|---|---|
| US (1) | US5942968A (en) |
| EP (1) | EP0810613B1 (en) |
| JP (1) | JP3951255B2 (en) |
| KR (1) | KR100453028B1 (en) |
| CN (1) | CN1100327C (en) |
| AU (1) | AU713453B2 (en) |
| BR (1) | BR9703423A (en) |
| CA (1) | CA2202967C (en) |
| CZ (1) | CZ293795B6 (en) |
| DE (2) | DE19622140A1 (en) |
| ES (1) | ES2252772T3 (en) |
| HR (1) | HRP970302B1 (en) |
| HU (1) | HU221226B1 (en) |
| PL (1) | PL183048B1 (en) |
| RU (1) | RU2172535C2 (en) |
| SI (1) | SI0810613T1 (en) |
| ZA (1) | ZA973633B (en) |
Families Citing this family (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19813135A1 (en) * | 1998-03-25 | 1999-09-30 | Asea Brown Boveri | Surge arresters |
| DE19942633A1 (en) * | 1999-09-07 | 2001-03-08 | Abb Hochspannungstechnik Ag | Surge arresters |
| KR20010069475A (en) * | 2001-03-27 | 2001-07-25 | 서형권 | Surge arrester |
| CN100446363C (en) * | 2002-07-19 | 2008-12-24 | 埃普科斯股份有限公司 | Overvoltage discharge protection device and application thereof |
| DE50311891D1 (en) * | 2003-02-12 | 2009-10-22 | Abb Technology Ag | Active part for a surge arrester |
| EP1603141B1 (en) | 2004-06-04 | 2016-08-24 | ABB Schweiz AG | Surge arrester with insulation by gas |
| EP1603140A1 (en) * | 2004-06-04 | 2005-12-07 | ABB Technology AG | Active component for an encapsulated surge arrester |
| EP1936639B1 (en) * | 2006-12-22 | 2009-07-15 | ABB Technology Ltd | Surge arrester |
| KR100858966B1 (en) * | 2007-09-21 | 2008-09-17 | 삼현씨앤에스 주식회사 | Varistor device |
| DE102011009124A1 (en) | 2011-01-21 | 2012-07-26 | Tridelta Überspannungsableiter Gmbh | Surge arrester with cage design |
| RU2474901C1 (en) * | 2011-09-06 | 2013-02-10 | Закрытое акционерное общество "Завод энергозащитных устройств" | Method to manufacture oxide-zinc varistors |
| EP2600358B1 (en) * | 2011-12-02 | 2014-04-30 | ABB Technology AG | Surge absorber |
| EP2953141B1 (en) * | 2014-06-04 | 2016-09-28 | ABB Schweiz AG | Surge arrester module and surge arrester |
| EP3144942B1 (en) * | 2015-09-18 | 2018-02-21 | Siemens Aktiengesellschaft | Surge arrester |
| JP6350611B2 (en) | 2016-08-10 | 2018-07-04 | 株式会社明電舎 | Lightning arrestor |
| CN211830199U (en) * | 2020-01-22 | 2020-10-30 | 伊顿智能动力有限公司 | Explosion-proof surge protector |
| JP2022052786A (en) * | 2020-09-24 | 2022-04-05 | 株式会社明電舎 | Arrester |
| CN113299445A (en) * | 2021-05-28 | 2021-08-24 | 固力发电气有限公司 | High-voltage composite post insulator |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3447118A (en) * | 1966-08-16 | 1969-05-27 | Westinghouse Electric Corp | Stacking module for flat packaged electrical devices |
| US3936785A (en) * | 1974-04-01 | 1976-02-03 | Cook Electric Company | Gas tube arrester subassembly |
| US3987343A (en) * | 1974-05-22 | 1976-10-19 | Joslyn Mfg. And Supply Co. | Surge protector |
| DE2861341D1 (en) * | 1977-06-17 | 1982-01-28 | Chisso Corp | Production of dichlorosilane derivatives |
| US5138517A (en) * | 1984-12-14 | 1992-08-11 | Hubbell Incorporated | Polymer housed electrical assemblies using modular construction |
| GB8527548D0 (en) * | 1985-11-08 | 1985-12-11 | Raychem Gmbh | Electrical equipment |
| FR2646957B1 (en) * | 1989-05-12 | 1994-02-04 | Sediver Ste Europ Isolateurs Ver | WATERPROOF ENCLOSURE BASED ON FILAMENTARY WINDING, AND COMPOSITE SURGE PROTECTION USING THE SAME |
| DE4306691A1 (en) * | 1993-03-04 | 1994-11-03 | Abb Management Ag | Surge arresters |
| SE516123C2 (en) * | 1994-05-13 | 2001-11-19 | Abb Ab | Valve diverter, method of making such and use |
| SE504075C2 (en) * | 1994-08-29 | 1996-11-04 | Asea Brown Boveri | Surge |
-
1996
- 1996-06-01 DE DE19622140A patent/DE19622140A1/en not_active Withdrawn
-
1997
- 1997-04-14 EP EP97810222A patent/EP0810613B1/en not_active Expired - Lifetime
- 1997-04-14 DE DE59712450T patent/DE59712450D1/en not_active Expired - Fee Related
- 1997-04-14 SI SI9730723T patent/SI0810613T1/en unknown
- 1997-04-14 ES ES97810222T patent/ES2252772T3/en not_active Expired - Lifetime
- 1997-04-17 CA CA002202967A patent/CA2202967C/en not_active Expired - Fee Related
- 1997-04-25 ZA ZA9703633A patent/ZA973633B/en unknown
- 1997-05-07 US US08/852,741 patent/US5942968A/en not_active Expired - Fee Related
- 1997-05-16 KR KR1019970018829A patent/KR100453028B1/en not_active IP Right Cessation
- 1997-05-28 PL PL97320246A patent/PL183048B1/en not_active IP Right Cessation
- 1997-05-29 HR HR970302A patent/HRP970302B1/en not_active IP Right Cessation
- 1997-05-29 CZ CZ19971664A patent/CZ293795B6/en not_active IP Right Cessation
- 1997-05-30 HU HU9700976A patent/HU221226B1/en not_active IP Right Cessation
- 1997-05-30 RU RU97108561/09A patent/RU2172535C2/en not_active IP Right Cessation
- 1997-05-30 CN CN97111462A patent/CN1100327C/en not_active Expired - Fee Related
- 1997-05-30 JP JP14230097A patent/JP3951255B2/en not_active Expired - Fee Related
- 1997-06-02 AU AU24663/97A patent/AU713453B2/en not_active Ceased
- 1997-06-02 BR BR9703423A patent/BR9703423A/en not_active Application Discontinuation
Also Published As
| Publication number | Publication date |
|---|---|
| US5942968A (en) | 1999-08-24 |
| CZ166497A3 (en) | 1998-12-16 |
| SI0810613T1 (en) | 2006-04-30 |
| JP3951255B2 (en) | 2007-08-01 |
| DE19622140A1 (en) | 1997-12-04 |
| PL320246A1 (en) | 1997-12-08 |
| AU713453B2 (en) | 1999-12-02 |
| HRP970302A2 (en) | 1998-02-28 |
| HUP9700976A3 (en) | 2000-03-28 |
| ES2252772T3 (en) | 2006-05-16 |
| HUP9700976A2 (en) | 1998-04-28 |
| EP0810613B1 (en) | 2005-10-26 |
| KR100453028B1 (en) | 2004-12-17 |
| AU2466397A (en) | 1997-12-11 |
| KR980005073A (en) | 1998-03-30 |
| CA2202967A1 (en) | 1997-12-01 |
| RU2172535C2 (en) | 2001-08-20 |
| PL183048B1 (en) | 2002-05-31 |
| BR9703423A (en) | 1998-09-08 |
| CZ293795B6 (en) | 2004-08-18 |
| JPH1070013A (en) | 1998-03-10 |
| EP0810613A2 (en) | 1997-12-03 |
| HU221226B1 (en) | 2002-08-28 |
| DE59712450D1 (en) | 2005-12-01 |
| HU9700976D0 (en) | 1997-07-28 |
| EP0810613A3 (en) | 1998-07-22 |
| CN1100327C (en) | 2003-01-29 |
| HRP970302B1 (en) | 2004-10-31 |
| CN1170939A (en) | 1998-01-21 |
| ZA973633B (en) | 1997-11-25 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |